Feed collet



I. H. SHEF'FER Sept. 5, 1950 FEED COLLET Filed July 5, 1947 Patented Sept. 5, 1950 UNITED STATES PATENT OFFICE FEED COLLET Irving H. Sheffer, Traverse City, Mich.

Application July 5, 1947, Serial N 0. 759,247

4 Claims.

This invention relates to improvements in feed collets, and refers particularly to feed collets wherein pads are employed for gripping the stock.

This invention aims, among other things, to provide a feed collet including an annular casing having a pad therein which is split radially into a plurality of separate sections; wherein spaced, resilient fingers are formed integral with the casing intermediately of its length to force the pad sections into engagement with stock extending through the collet; and wherein at least some peripheral portions of the pad sections are flat throughout their length for engagement by the resilient fingers to prevent rotation of the pad in the casing.

Another object of the invention is to provide such a feed collet wherein at least some of the longitudinal margins of the flat sides of the pad sections project into slots formed between adjacent fingers so that rotation of the pad in the casing is positively prevented.

A further object of the invention is to provide a feed collet including an annular casing and a plurality of pad sections which are readily insertable into or removable from the casing; and wherein both the casing and the pad sections are so constructed that they may be relatively cheaply and easily manufactured.

Having thus briefly stated some of the objects and advantages of the invention I will now describe it in detail with the aid of the accompanying drawing, in which:

Figure 1 is a side view of the invention with the pad sections made for holding round stock.

Figure 2 is a section on the line 2-2 of 'Figure 1.

Figure 3 is a section on the line 3-3 of Figure 2.

Figure 4 is a side elevation showing a slight modification wherein the pad sections are made for holding multi-sided stock.

Figure 5 is a section on the line 5-5 of Figure 4.

Figure 6 shows another slight modification wherein portions of the periphery of the pad sections are fiat and the remaining portions are arcuate.

Figure 7 is a section on the line 'l'l of Figure 6.

Referring to the drawing, l designates an annular casing provided intermediately of its length with a plurality of longitudinal slots 2 thereby forming fingers 3 between them. These fingers are resilient and the diametrical distance between opposed pairs is somewhat less than the major portion of the casing bore. Formed integral with the front extremity of the casing l is an internal'annular fiange 4 the bore of which is less than the diametrical spacing between the opposed fingers 3, and the rear extremity of the casing is internally threaded at 5 to receive the correspondingly threaded end of an annular plug 5 which projects rearwardly beyond the casing and is also threaded externally at its opposite end for attachment to a feed tube indicated at 8.

The pad 9, which is split radially into a plurality of separate sections 911, is inserted in the annular casing I and held against longitudinal movement therein at its front extremity by the rear face of the annular flange 4 and at its rear extremity by the plug 1.

Referring now to Figure 2, the pad 9 which was first bored at Ill to the required size to receive and engage the circular stock A is provided with the same number of fiat peripheral faces H as there are fingers 3 around the casing l, so that each finger, which is transversely substantially flat, bears throughout its width against one of the peripheral faces of the pad. The pad was then split radially into two equal sections 9a, in the present instance centrally through two opposed fiat peripheral faces ll, so that two opposed fingers 3 each bear against two short severed faces Ila one on each pad section 9a. It will be noted that the longitudinal margins or corners l2 formed along the junction of each adjacent pair of fiat peripheral faces ll, which are of course angularly disposed to one another, project into theslots 2 formed between adjacent fingers 3. Thus not only does the relatively wide bearing of each finger 3 against one fiat face H, or against two adjacent faces lla, prevent rotation of the pad in the casing, but the outer longitudinal margins or corners I? which project into the slots 2 positively prevent any such rotary movement.

In the modification shown in Figure 5 the pad 9 is provided with a longitudinal bore Illa of hexagonal cross section to engage the sides of hexagonal stock B. The outer periphery of the pad 9 is also hexagonal in cross section and has each fiat peripheral face llb parallel with the adjacent fiat face in the bore lllb. The casing is provided with six fingers 3 each of which again bears against one flat peripheral face lib. The pad 9 is radially split in this case into three equal sections 9b so that two entire fiat faces l lb occur on each pad section. The longitudinal margins or corners l2b between two adjacent fiat faces 3 llb again project into the slots 2 formed between adjacent fingers 3.

In the modification shown in Figure '7, the pad 9 is radially split into two equal sections 90. Extending an equal distance from and at right angles to the radial slot Short flat peripheral faces Hc are formed on both sections 90 so that the total length of the two contiguous flat faces on each side of the pad is somewhat longer than the width of one of the fingers}, The pe ripheral form of each pad section between the adjacent ends of the two short flat faces He is arcuate as shown at 1 1d. Against each arcuate portion two of the fingers 3 bear to force'each section inwardly. Thus only two opposite fingers are in this case relied on to prevent rotatioii' of the pad sections, though outwardly projecting corners 120 are again formed this time at the junction of each flat face He with one arcuate per nl ldi-an ea h o the e rners PJWF into easing slot 2 to fu'rt'her revent rotary of the pad; he ripening ma formed J 3; through the pad is this case shown r f e circular stock 7 It will no ever be understood that the cross eeufhaiform of t'heopening l0, 1% or lt c'ma'y be ed-v0 S'uit eater es stock is be res t ereby; that the 15m ay be divided radially as re uired I upon thefcasing Tnients oi the invention h'ave been scribed and Withiii message or the aerated-ed earns;

or reduced s zetress ona-lly both Eternally tu dinallyslotted to meanness, sausages bee' a l w t Pe age i "Ffiu a t th i eewi into any preferred num bf-secti'ohSgand-that s own it isunderstood that "alterations'an item'- ha I, l im is ahd ekternally intermematelybfits jiengtnft'h log resilient ase harsh-e1 with the'axis of the i t is y umber of angels may-be provi ed flan e -may hematite-there prov e'cl they'fall 1. -A- feed 0' et incl an' muareasi g ite ie'aiate semen of th easingbeing'lorigicasing, a mranty or paid sections in the eas ng this: 18 g tions intermediately of their length bearing against the inner sides of the resilient fingers, said sections being urged toward the axis of the casing by the fingers to engage stock extending through the casing, coacting means on the inner sides of the fingers and the outer sides of the pad sections holding said sections against rotary movement in the annular casing, means preventing axial movement of the sections in the easing, and means for mounting the casing On a feed tube.

3. A feed collet including an annular casing of reduced size both inside and outside interrne'diately of its length, the intermediate portion of reduced size being longitudinally slotted to form fingers, said fingers being resilient and parallel with the axis of the casing, a plurality of pad sections fiat longitudinally throughout their length in the casing parallel with the axis of the latter, the outer sides of the pad sections iiltr'rile'diately of their length bearing against the inner sides of the resilient fih'gei's; said sectiohs Being urged toward the axis of the casing by the fingers, the inner sides of at least some of the fingers bein not transversely and engaging tonespohum'gry shaped outer sides of the bad sections, means preventing a'xial movement of the sections, in the casing, and means for mounting the casing on a feed tube.

4. 'A feed colle't including an annular casing of reamedsiz'e both internally and 'e'xtern'ally intermediate]? of its length, the intermediate portion of reduced size being longitudinally slotted to form fingers, said fingers being resiliexit and par'alllwith the axis of the casing, a plurality of longitudinally flat pad sections in the casing parallel with the axis of the latter throughout their length; the outer faces of the tea sections intei-niediatel-y of their length bearing against the ir'hier faces of the resilient fingers,- said section's eing urged toward the axis of the casing by said fingers; the inner faces of the latter the outer faces of the pad sections being flat transversely whereby the sections'. are held against rotary movement in the casing, prevent axial movement of the sections in the casing, and means for mounting the casing on a 'fe'e'd'tube.

IRVING H. SHEFFER.

REFERENCES CITED fliefollowing"referencesar of record in the file of this patent: Y

' UiiifrE'n STATES FATENTs 

